Count Pulses and duration

[Acetronics2]

if the two inputs start and stop together ... the length of ch1 is the sum of all pulses @ ch2 ... ( M. de La Pallice )

so, no need to care of ch1 ...

aaaaa.......

just need to log pulses @ ch 2 ...

one "pulsin" followed by enough "RC Time"s will do it ...

Alain

[ruijc]

Hi there,

@Henrik

I was thinking of using a 12F615. The MCu will only have a tight loop where it's just waiting for the inputs to start.
After stopping it will analise the results and can go back to wait for signals again or move forward.

@Alain

Yes... both start and stop together...the problem is that the pulses ( 35ms ) may vary in quantity in the same period of time.

Regards
Rui

[HenrikOlsson]

Hi,
OK, so the 12F615 has the TMR1 Gate feature, I'd say you're good to go for an all hardware solution - and since there's no pulses on second line when the first line isn't high then it gets even easier.

Set up TMR1 as a timer with the gate control enabled, clear it and feed the "long" pulse to the gate control pin, this will measure the duration of the long pulse. Set TMR0 up as a counter, clear it and feed the pulses to the counter input, this will count the number of pulses.

If you use the comparator as the gate control for TMR1 you might be able to set an interrupt up to trip when the duration of the long pulse ends.

/Henrik.

[Acetronics2]

@Alain

Yes... both start and stop together...the problem is that the pulses ( 35ms ) may vary in quantity in the same period of time.

Regards
Rui

and ... Where's the problem ???

the RCTime timeout feature will take care of that for you ...

Alain

[ruijc]

Thanks guys,

I still have some doubts on how to code this but i will use your tips, study them a bit and try some lines of code.

Regards
Rui